You continue on, following a trail leading up a steep incline. You hear loud, bumpeting sounds from a nearby ravine-the sounds of a large animal. You climb over some rocks and find yourself looking down on one of the largest land mammals that ever lived – the wooly mammoth. Huge as this creature is, its size is exaggerated even more by  its thick coat of wool.

You are cold, desperate, and tired. From your rock ledge, only a few feet over the mammoth, you could drop down on its back, burrow into its warn wool, and ride where it takes you!